The words pile, stack and heap all mean “a mass of things placed one of top of the other”. A pile is a usually tidy collection of objects, usually of the same kind:a pile of books/papers/leaves
A stack is a carefully arranged pile usually made up of a lot of things of the same shape and size:
a stack of books/coins/cassettes
A heap is a large disorderly pile of things, not necessarily of the same kind:
a heap of toys/books/dirty washing
Both pile and heap can be used with uncountable nouns:
a pile/heap of sand/straw/manure.
The BK Stacker sandwiches are a family of hamburgers sold by the international fast-food restaurant chain Burger King. It is one of their late-teen–to–young-adult, male-oriented products. The BK Stacker is a hamburger consisting of anywhere from two to four grilled beef patties, American cheese, bacon and Stacker sauce (a Thousand Island dressing variant) served on a sesame seed bun. 
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